The Ultimate Guide to the S&S Air Filter for Your 2024 CVO Street Glide

Upgrading to an S&S air filter is one of the most effective and popular modifications you can make to your 2024 Harley-Davidson CVO Street Glide. This single change delivers immediate improvements in throttle response, engine sound, and overall performance by allowing your Milwaukee-Eight 121 engine to breathe more efficiently. For owners seeking to unlock their motorcycle's full potential, the S&S air cleaner kit represents a foundational upgrade that pairs perfectly with other performance enhancements.

This comprehensive guide will explain everything you need to know about selecting, installing, and benefiting from an S&S air filter on your premium touring machine. We will cover the specific advantages for the 2024 CVO model, provide a detailed installation walkthrough, discuss tuning considerations, and answer common owner questions.

Why Upgrade the Air Intake on a 2024 CVO Street Glide?

The Harley-Davidson CVO Street Glide comes from the factory with a highly capable air intake system. However, it is designed with compromises to meet strict emissions regulations, sound limitations, and cost targets. The stock airbox and filter are engineered to be very quiet and to filter air with extreme efficiency, which can slightly restrict airflow.

The 121 cubic inch (1983cc) Milwaukee-Eight engine in the 2024 CVO is a powerhouse that thrives on increased air volume. More air, combined with the correct amount of fuel, results in more complete combustion and greater power. An aftermarket air filter from a leader like S&S Cycle is designed with a singular focus: maximizing airflow while still providing excellent filtration. The design uses less restrictive filtering media and often features a larger overall intake area. This reduces the suction effort required by the engine, freeing up horsepower that was previously used just to draw air in. The result is power that is more readily available, especially during acceleration and at higher speeds.

Beyond pure performance, the aesthetic change is significant. S&S kits replace the entire air cleaner assembly, offering a variety of styles—from classic teardrop designs to modern exposed element looks—that dramatically enhance the engine's appearance. The distinctive growl of the intake sucking in air becomes more pronounced, adding to the motorcycle's acoustic character without being overly loud like an exhaust change might be.

Selecting the Right S&S Air Cleaner Kit for Your Model

S&S Cycle offers several series of air cleaners suitable for the 2024 CVO Street Glide. Choosing the right one depends on your performance goals, aesthetic preference, and budget.

1. The SuperStock Air Cleaner: This is often the top recommendation for CVO Street Glide owners. It strikes an ideal balance between high-flow performance, top-tier filtration, and a clean, OEM-plus appearance. It typically uses a precision-pleated synthetic filter media that offers significantly less restriction than the stock paper filter. The assembly is designed to fit perfectly under the stock CVO side panels without modification, maintaining the bike's sleek touring profile while delivering substantial gains.

2. The Stealth Air Cleaner: As the name implies, this kit is designed for a minimalist, modern look. It often features a round or oval filter element that is more exposed, giving the engine a muscular, performance-oriented appearance. The Stealth series provides exceptional airflow and is a favorite among riders who want their upgrade to be visually noticeable. You must ensure compatibility with your specific model's bodywork, as some configurations may require slight adjustments or different mounting hardware.

3. The Classic Teardrop Air Cleaner: For riders who cherish the timeless Harley-Davidson look, the teardrop style is iconic. S&S's version incorporates their high-flow technology into this classic shape. It provides a notable performance boost while paying homage to traditional styling. This is an excellent choice if you prefer a vintage-inspired aesthetic on your modern CVO.

When purchasing, always confirm the kit is specifically listed for the 2024 CVO Street Glide with the Milwaukee-Eight 121 engine. Kits for other models may not clear the unique fuel injection hardware, engine covers, or bodywork of the CVO.

Step-by-Step Installation Guide

Installing an S&S air cleaner is a straightforward task that most owners can complete in under an hour with basic tools. Always begin by ensuring the motorcycle is cool and parked on a level, stable surface.

Tools and Parts Needed: The S&S kit is complete and includes the backing plate, filter element, gaskets, and all necessary hardware. You will typically need a set of hex keys (Allen wrenches), a torque wrench, and perhaps a flathead screwdriver. Have a clean rag and some mild degreaser on hand.

Step 1: Remove the Stock Air Cleaner. Open the air cleaner cover according to your owner's manual. Usually, this involves loosening a central nut or several perimeter screws. Carefully remove the cover, the old filter, and then the backing plate. There will be a gasket between the backing plate and the throttle body. Peel this old gasket off and use the degreaser and rag to clean the mating surface on the throttle body thoroughly. Any debris left here can be sucked into the engine.

Step 2: Install the New S&S Backing Plate. Place the new provided gasket onto the throttle body. Position the S&S backing plate over the studs, aligning it properly. Slide the provided washer and nut onto each stud. Using a crisscross pattern, tighten the nuts gradually. It is crucial to consult the S&S instructions for the final torque specification, but it is generally low, around 15-20 ft-lbs. Overtightening can strip the threads or warp the plate.

Step 3: Assemble the Filter Element. Depending on your kit, you may need to attach the filter media to its housing or directly to the backing plate. Some models have a separate outer ring that clamps the filter element. Follow the included diagrams precisely. Ensure any sealing surfaces are clean and the filter is seated evenly.

Step 4: Mount the Cover and Final Assembly. Place the air cleaner cover over the filter and secure it with the supplied hardware. Again, tighten the screws or nut in a star pattern to ensure even pressure and prevent air leaks. Double-check that all hoses (such as the crankcase breather hose, which is often rerouted or connected to a fitting on the new backing plate) are securely reattached. A loose hose is a common source of post-installation issues.

Step 5: Pre-Start Inspection. Before starting the bike, do a final visual inspection. Verify there is no obvious gap between the assembly and the throttle body. Ensure no tools or rags are left near the intake area. Start the motorcycle and let it idle. Listen for any unusual hissing sounds that would indicate an air leak. Briefly blip the throttle and observe the engine response.

The Critical Importance of Engine Tuning

This is the most important section for ensuring a successful upgrade. The 2024 CVO Street Glide's engine control unit (ECU) is programmed for the airflow characteristics of the stock airbox. When you install a high-flow air filter, you change the amount of air entering the engine. If the ECU does not adjust the fuel delivery to match this increased air, the engine will run lean—meaning too much air for the amount of fuel.

A lean condition can cause several problems: elevated engine temperatures, hesitation or surging, poor throttle response, and in severe cases, engine damage over time. Therefore, installing an S&S air filter absolutely requires an ECU tune or fuel management adjustment.

For the 2024 CVO, you have two primary tuning paths:

1. Using a Dedicated Fuel Tuner/Programmer: Devices like the Power Vision from Dynojet or the Thunder Max ECM are popular choices. These units plug into your motorcycle's diagnostic port. They come with pre-loaded "maps" or tunes specifically designed for your model with an S&S air filter and various exhaust configurations. You simply select the map that matches your setup, upload it to the ECU, and the device optimizes fuel delivery, ignition timing, and other parameters. Many also allow for custom tuning on a dynamometer for maximum performance.

2. Seeking Professional Dyno Tuning: The best possible results come from a professional tuner using a dynamometer. The tuner will secure your motorcycle on the dyno, connect a wide-band oxygen sensor to the exhaust, and run the engine under load at various RPMs and throttle positions. Software then creates a perfectly customized fuel map for your exact combination of air filter, exhaust, altitude, and fuel quality. While this is the most expensive option, it yields optimal performance, drivability, and safety for your engine.

Do not skip this step. A proper tune is not optional; it is an integral part of the air filter installation process.

Performance Expectations and Real-World Benefits

With the S&S air filter and a correct tune installed, you will notice tangible improvements in how your CVO Street Glide rides.

Immediate Throttle Response: The most common feedback is the elimination of any sluggishness when rolling on the throttle. The engine feels more eager and responsive, particularly in the low-to-mid RPM range where you do most of your riding. Passing power and freeway merging become more confident.

Enhanced Engine Sound: You will hear a deeper, more satisfying intake growl when you accelerate. This is the sound of your engine breathing freely. It complements the exhaust note without drastically increasing overall volume at cruise.

Potential Power Gains: While peak horsepower gains on a otherwise stock engine might be modest (often 5-10%), the gain in the area under the curve—the usable power throughout the RPM range—is more significant. The engine feels less strained. These gains become substantially larger when the air filter is combined with a high-flow exhaust system and a full tune, as the parts work together synergistically.

Long-Term Reliability: A high-quality air filter like those from S&S provides excellent protection. Their filtering media is designed to trap harmful particles without the excessive restriction of cheap, dense materials. By ensuring your engine runs at the correct air-fuel ratio (via tuning), you also promote cleaner combustion, which can lead to reduced carbon buildup and more consistent long-term operation.

Maintenance and Care for Your S&S Filter

Maintaining your new air filter is simple but essential. S&S recommends cleaning and re-oiling the filter element every 10,000 to 15,000 miles under normal riding conditions. If you frequently ride in dusty or dirty environments, inspect and service it more often.

Cleaning Process: You will need a specific S&S Air Filter Cleaner Kit or comparable brand-name products. Never use gasoline or harsh solvents. Remove the filter from the backing plate. Spray it thoroughly with the cleaner and let it soak for 10-15 minutes. Rinse it gently from the inside out with low-pressure water until the water runs clear. Shake off excess water and let it air dry completely—this is vital. Once dry, apply the special filter oil evenly over the entire outer surface. The oil is tacky and designed to catch fine particles. Let the oil wick into the media for 15-20 minutes, then reinstall. A properly maintained filter will last for tens of thousands of miles.

Addressing Common Questions and Concerns

Will this void my warranty? According to the Magnuson-Moss Warranty Act in the United States, a dealer cannot void your warranty simply for installing an aftermarket part. However, they must prove that the part directly caused a failure to deny a warranty claim. Using a reputable brand like S&S and, crucially, ensuring the engine is properly tuned minimizes risk. It is advisable to discuss modifications with your dealer.

Can I install just the filter without the whole kit? No. The S&S system is engineered as a complete unit. The backing plate, sealing system, and filter element are designed to work together. Attempting to retrofit just the filter media into the stock housing is unlikely to yield benefits and could cause air leaks.

Is a stage upgrade necessary? Harley-Davidson markets "Stage" upgrades. An S&S air filter is essentially the core of a Stage I upgrade. For the 2024 CVO Street Glide, Stage I (air filter and tune) is a perfect standalone improvement. Stages II and III involve camshaft upgrades and are major projects for those seeking maximum horsepower.

Conclusion

Investing in an S&S air filter for your 2024 CVO Street Glide is a decision that pays dividends every time you ride. It unlocks a more responsive, better-sounding, and more enjoyable version of your motorcycle's already impressive engine. The process is simple, but its success hinges on pairing the hardware upgrade with the essential software tune. By following this guide—selecting the right kit, installing it carefully, and tuning the ECU professionally—you will achieve the performance and reliability you expect from a premier touring motorcycle. This upgrade stands as a cornerstone for any future performance modifications, solidifying your CVO Street Glide's status as a true performer on the open road.